msi: Use the intended attributes when overwriting the target file in cabinet_copy_file.

[Thomas Faber]

The current code uses the old file's attributes, which means it would
make the file read-only again. This would e.g. prevent the deletion of
the file at the end of test_readonlyfile_cab (and should probably even
make this CreateFileW call fail since it specifies GENERIC_WRITE).

The reason this currently works in Wine is that CreateFile keeps the
existing file attributes in this case (see the todo_wine in
test_NtCreateFile).

The patch fixes msi to use the correct attributes as returned by the
callback.
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